artiq/artiq/coredevice/comm_generic.py

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import struct
import logging
from enum import Enum
from fractions import Fraction
from artiq.language import core as core_language
logger = logging.getLogger(__name__)
class _H2DMsgType(Enum):
LOG_REQUEST = 1
IDENT_REQUEST = 2
SWITCH_CLOCK = 3
LOAD_LIBRARY = 4
RUN_KERNEL = 5
RPC_REPLY = 6
FLASH_READ_REQUEST = 7
FLASH_WRITE_REQUEST = 8
FLASH_ERASE_REQUEST = 9
FLASH_REMOVE_REQUEST = 10
class _D2HMsgType(Enum):
LOG_REPLY = 1
IDENT_REPLY = 2
CLOCK_SWITCH_COMPLETED = 3
CLOCK_SWITCH_FAILED = 4
LOAD_COMPLETED = 5
LOAD_FAILED = 6
KERNEL_FINISHED = 7
KERNEL_STARTUP_FAILED = 8
KERNEL_EXCEPTION = 9
RPC_REQUEST = 10
FLASH_READ_REPLY = 11
FLASH_OK_REPLY = 12
FLASH_ERROR_REPLY = 13
class UnsupportedDevice(Exception):
pass
class CommGeneric:
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def __init__(self):
self._read_type = self._write_type = None
self._read_length = 0
self._write_buffer = []
def open(self):
"""Opens the communication channel.
Must do nothing if already opened."""
raise NotImplementedError
def close(self):
"""Closes the communication channel.
Must do nothing if already closed."""
raise NotImplementedError
def read(self, length):
"""Reads exactly length bytes from the communication channel.
The channel is assumed to be opened."""
raise NotImplementedError
def write(self, data):
"""Writes exactly length bytes to the communication channel.
The channel is assumed to be opened."""
raise NotImplementedError
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#
# Reader interface
#
def _read_header(self):
self.open()
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if self._read_length > 0:
raise IOError("Read underrun ({} bytes remaining)".
format(self._read_length))
# Wait for a synchronization sequence, 5a 5a 5a 5a.
sync_count = 0
while sync_count < 4:
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(sync_byte, ) = struct.unpack("B", self.read(1))
if sync_byte == 0x5a:
sync_count += 1
else:
sync_count = 0
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# Read message header.
(self._read_length, ) = struct.unpack(">l", self.read(4))
if not self._read_length: # inband connection close
raise OSError("Connection closed")
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(raw_type, ) = struct.unpack("B", self.read(1))
self._read_type = _D2HMsgType(raw_type)
if self._read_length < 9:
raise IOError("Read overrun in message header ({} remaining)".
format(self._read_length))
self._read_length -= 9
logger.debug("receiving message: type=%r length=%d",
self._read_type, self._read_length)
def _read_expect(self, ty):
if self._read_type != ty:
raise IOError("Incorrect reply from device: {} (expected {})".
format(self._read_type, ty))
def _read_empty(self, ty):
self._read_header()
self._read_expect(ty)
def _read_chunk(self, length):
if self._read_length < length:
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raise IOError("Read overrun while trying to read {} bytes ({} remaining)"
" in packet {}".
format(length, self._read_length, self._read_type))
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self._read_length -= length
return self.read(length)
def _read_int8(self):
(value, ) = struct.unpack("B", self._read_chunk(1))
return value
def _read_int32(self):
(value, ) = struct.unpack(">l", self._read_chunk(4))
return value
def _read_int64(self):
(value, ) = struct.unpack(">q", self._read_chunk(8))
return value
def _read_float64(self):
(value, ) = struct.unpack(">d", self._read_chunk(8))
return value
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def _read_bytes(self):
return self._read_chunk(self._read_int32())
def _read_string(self):
return self._read_bytes()[:-1].decode('utf-8')
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#
# Writer interface
#
def _write_header(self, ty):
self.open()
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logger.debug("preparing to send message: type=%r", ty)
self._write_type = ty
self._write_buffer = []
def _write_flush(self):
# Calculate message size.
length = sum([len(chunk) for chunk in self._write_buffer])
logger.debug("sending message: type=%r length=%d", self._write_type, length)
# Write synchronization sequence, header and body.
self.write(struct.pack(">llB", 0x5a5a5a5a,
9 + length, self._write_type.value))
for chunk in self._write_buffer:
self.write(chunk)
def _write_empty(self, ty):
self._write_header(ty)
self._write_flush()
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def _write_chunk(self, chunk):
self._write_buffer.append(chunk)
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def _write_int8(self, value):
self._write_buffer.append(struct.pack("B", value))
def _write_int32(self, value):
self._write_buffer.append(struct.pack(">l", value))
def _write_int64(self, value):
self._write_buffer.append(struct.pack(">q", value))
def _write_float64(self, value):
self._write_buffer.append(struct.pack(">d", value))
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def _write_bytes(self, value):
self._write_int32(len(value))
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self._write_buffer.append(value)
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def _write_string(self, value):
self._write_bytes(value.encode("utf-8") + b"\0")
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#
# Exported APIs
#
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def reset_session(self):
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self.write(struct.pack(">ll", 0x5a5a5a5a, 0))
def check_ident(self):
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self._write_empty(_H2DMsgType.IDENT_REQUEST)
self._read_header()
self._read_expect(_D2HMsgType.IDENT_REPLY)
runtime_id = self._read_chunk(4)
if runtime_id != b"AROR":
raise UnsupportedDevice("Unsupported runtime ID: {}"
.format(runtime_id))
def switch_clock(self, external):
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self._write_header(_H2DMsgType.SWITCH_CLOCK)
self._write_int8(external)
self._write_flush()
self._read_empty(_D2HMsgType.CLOCK_SWITCH_COMPLETED)
def load(self, kernel_library):
self._write_header(_H2DMsgType.LOAD_LIBRARY)
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self._write_chunk(kernel_library)
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self._write_flush()
self._read_empty(_D2HMsgType.LOAD_COMPLETED)
def run(self):
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self._write_empty(_H2DMsgType.RUN_KERNEL)
logger.debug("running kernel")
def flash_storage_read(self, key):
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self._write_header(_H2DMsgType.FLASH_READ_REQUEST)
self._write_string(key)
self._write_flush()
self._read_header()
self._read_expect(_D2HMsgType.FLASH_READ_REPLY)
return self._read_chunk(self._read_length)
def flash_storage_write(self, key, value):
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self._write_header(_H2DMsgType.FLASH_WRITE_REQUEST)
self._write_string(key)
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self._write_bytes(value)
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self._write_flush()
self._read_header()
if self._read_type == _D2HMsgType.FLASH_ERROR_REPLY:
raise IOError("Flash storage is full")
else:
self._read_expect(_D2HMsgType.FLASH_OK_REPLY)
def flash_storage_erase(self):
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self._write_empty(_H2DMsgType.FLASH_ERASE_REQUEST)
self._read_empty(_D2HMsgType.FLASH_OK_REPLY)
def flash_storage_remove(self, key):
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self._write_header(_H2DMsgType.FLASH_REMOVE_REQUEST)
self._write_string(key)
self._write_flush()
self._read_empty(_D2HMsgType.FLASH_OK_REPLY)
def _receive_rpc_value(self, tag):
if tag == "n":
return None
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elif tag == "b":
return bool(self._read_int8())
elif tag == "i":
return self._read_int32()
elif tag == "I":
return self._read_int64()
elif tag == "f":
return self._read_float64()
elif tag == "F":
numerator = self._read_int64()
denominator = self._read_int64()
return Fraction(numerator, denominator)
elif tag == "l":
elt_tag = chr(self._read_int8())
length = self._read_int32()
return [self._receive_rpc_value(elt_tag) for _ in range(length)]
else:
raise IOError("Unknown RPC value tag: {}", tag)
def _receive_rpc_values(self):
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result = []
while True:
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tag = chr(self._read_int8())
if tag == "\x00":
return result
else:
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result.append(self._receive_rpc_value(tag))
def _serve_rpc(self, rpc_map):
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service = self._read_int32()
args = self._receive_rpc_values()
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logger.debug("rpc service: %d %r", service, args)
eid, result = rpc_wrapper.run_rpc(rpc_map[rpc_num], args)
logger.debug("rpc service: %d %r == %r (eid %d)", service, args,
result, eid)
self._write_header(_H2DMsgType.RPC_REPLY)
self._write_int32(eid)
self._write_int32(result)
self._write_flush()
def _serve_exception(self):
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eid = self._read_int32()
params = [self._read_int64() for _ in range(3)]
rpc_wrapper.filter_rpc_exception(eid)
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raise exception(self.core, *params)
def serve(self, rpc_map):
while True:
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self._read_header()
if self._read_type == _D2HMsgType.RPC_REQUEST:
self._serve_rpc(rpc_map)
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elif self._read_type == _D2HMsgType.KERNEL_EXCEPTION:
self._serve_exception()
else:
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self._read_expect(_D2HMsgType.KERNEL_FINISHED)
return
def get_log(self):
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self._write_empty(_H2DMsgType.LOG_REQUEST)
self._read_header()
self._read_expect(_D2HMsgType.LOG_REPLY)
return self._read_chunk(self._read_length).decode('utf-8')